Re: optional ipv6 support

[David Fifield <david () bamsoftware com>]

On Tue, Jan 29, 2013 at 10:24:12PM -0500, Rick "Zero_Chaos" Farina wrote:
> Currently the only ipv6 related things happening in configure.ac is this:
>
> dnl Check IPv6 raw sending flavor.
> CHECK_IPV6_IPPROTO_RAW
>
> This means that when configure runs it checks libpcap for ipv6 support
> and enables if it finds support.
>
> For many reasons, this is not a great thing.  So call "automagic
> dependencies" [1] cause a great deal of heartache when things are
> rebuilt or binaries are transfered to other systems.  Would it be
> possible to add --enable-ipv6 --disable-ipv6 flags like in nbase?
>
> # Check for IPv6 support -- modified from Apache 2.0.40:
>
> AC_ARG_ENABLE(ipv6,
>   [  --disable-ipv6          Disable IPv6 support ],
>   [ if test "$enableval" = "no"; then
>         user_disabled_ipv6=1
>     fi ],
>   [ user_disabled_ipv6=0 ] )
>
> Thanks for your consideration,

Nmap gets its value for HAVE_IPV6 from nbase, so it should already work
as you wish. It's possible that there is code referring to IPv6 that is
not protected by HAVE_IPV6 guards, but that would be a separate bug.

I just tried configuring Nmap with
        ./configure --disable-ipv6
and HAVE_IPV6 is disabled in nbase_config.h, as expected.

David Fifield
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